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Perceived exertion in fatiguing illness: Gulf War veterans with chronic fatigue syndrome.
Med Sci Sports Exerc. 2003 Apr; 35(4):569-74.MS

Abstract

PURPOSE

It has been reported that ratings of perceived exertion (RPE) are elevated in chronic fatigue syndrome (CFS). We have challenged this notion by examining perceived exertion in civilian females with CFS and expressing the data relative to exercise capacity (%[OV0312]O(2max)). The purpose of the present investigation was to further examine RPE during exercise in a unique population of CFS patients, Gulf veterans (GV).

METHODS

Thirty-four GV (N = 15 CFS, 42 +/- 8 yr; N = 19 healthy, 43 +/- 5 yr) performed a maximal exercise test on a cycle ergometer. After a 3-min warm-up, exercise intensity increased by 30 W every minute until exhaustion. RPE were obtained during the last 15 s of each minute using Borg's CR-10 scale.

RESULTS

With the exception of peak [OV0312]E, there were no significant differences in any peak exercise variables. Repeated measures ANOVA revealed significantly higher RPE at each power output examined (F(1,32) = 16.4, P < 0.001). Group differences in RPE remained significant when analyzed relative to peak [OV0312]O(2) (F(1,32) = 7.2, P = 0.01). Both group main effects and the interaction were eliminated when self-reported fatigue symptoms were controlled for in the analyses. Power functions for RPE as a function of relative oxygen consumption were not different between groups and were significantly greater than a linear value of 1.0 (1.6 +/- 0.3 for both groups, P < 0.02).

CONCLUSIONS

Our results show that RPE are greater in GV with CFS regardless of whether the data were expressed in terms of absolute or relative exercise intensity. However, self-reported fatigue associated with CFS eliminated the group differences. These results suggest that GV with CFS were unique compared with their civilian counterparts. Future research aimed at determining the influence of preexisting fatigue on RPE during exercise is warranted.

Authors+Show Affiliations

Center for the Study of War-Related Illnesses, VA NJ Health Care, East Orange, NJ 07018, USA. cookdb@njneuromed.orgNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

12673138

Citation

Cook, Dane B., et al. "Perceived Exertion in Fatiguing Illness: Gulf War Veterans With Chronic Fatigue Syndrome." Medicine and Science in Sports and Exercise, vol. 35, no. 4, 2003, pp. 569-74.
Cook DB, Nagelkirk PR, Peckerman A, et al. Perceived exertion in fatiguing illness: Gulf War veterans with chronic fatigue syndrome. Med Sci Sports Exerc. 2003;35(4):569-74.
Cook, D. B., Nagelkirk, P. R., Peckerman, A., Poluri, A., Lamanca, J. J., & Natelson, B. H. (2003). Perceived exertion in fatiguing illness: Gulf War veterans with chronic fatigue syndrome. Medicine and Science in Sports and Exercise, 35(4), 569-74.
Cook DB, et al. Perceived Exertion in Fatiguing Illness: Gulf War Veterans With Chronic Fatigue Syndrome. Med Sci Sports Exerc. 2003;35(4):569-74. PubMed PMID: 12673138.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Perceived exertion in fatiguing illness: Gulf War veterans with chronic fatigue syndrome. AU - Cook,Dane B, AU - Nagelkirk,Paul R, AU - Peckerman,Arnold, AU - Poluri,Ashok, AU - Lamanca,John J, AU - Natelson,Benjamin H, PY - 2003/4/4/pubmed PY - 2004/3/17/medline PY - 2003/4/4/entrez SP - 569 EP - 74 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 35 IS - 4 N2 - PURPOSE: It has been reported that ratings of perceived exertion (RPE) are elevated in chronic fatigue syndrome (CFS). We have challenged this notion by examining perceived exertion in civilian females with CFS and expressing the data relative to exercise capacity (%[OV0312]O(2max)). The purpose of the present investigation was to further examine RPE during exercise in a unique population of CFS patients, Gulf veterans (GV). METHODS: Thirty-four GV (N = 15 CFS, 42 +/- 8 yr; N = 19 healthy, 43 +/- 5 yr) performed a maximal exercise test on a cycle ergometer. After a 3-min warm-up, exercise intensity increased by 30 W every minute until exhaustion. RPE were obtained during the last 15 s of each minute using Borg's CR-10 scale. RESULTS: With the exception of peak [OV0312]E, there were no significant differences in any peak exercise variables. Repeated measures ANOVA revealed significantly higher RPE at each power output examined (F(1,32) = 16.4, P < 0.001). Group differences in RPE remained significant when analyzed relative to peak [OV0312]O(2) (F(1,32) = 7.2, P = 0.01). Both group main effects and the interaction were eliminated when self-reported fatigue symptoms were controlled for in the analyses. Power functions for RPE as a function of relative oxygen consumption were not different between groups and were significantly greater than a linear value of 1.0 (1.6 +/- 0.3 for both groups, P < 0.02). CONCLUSIONS: Our results show that RPE are greater in GV with CFS regardless of whether the data were expressed in terms of absolute or relative exercise intensity. However, self-reported fatigue associated with CFS eliminated the group differences. These results suggest that GV with CFS were unique compared with their civilian counterparts. Future research aimed at determining the influence of preexisting fatigue on RPE during exercise is warranted. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/12673138/Perceived_exertion_in_fatiguing_illness:_Gulf_War_veterans_with_chronic_fatigue_syndrome_ DB - PRIME DP - Unbound Medicine ER -